using System;
using System.Configuration;
using System.Diagnostics;
using System.IO;
using System.Xml.Serialization;

namespace Bro.Common.Util
{

    /// <summary>
    /// 配置文件帮助类
    /// </summary>
    public class ConfigHelper
    {

        private static object ioLock = new object();

        /// <summary>
        /// 载入XML配置文件
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="filePath"></param>
        /// <returns></returns>
        public static T Load<T>(string filePath)
        {
            try
            {

                lock (ioLock)
                {
                    if (!File.Exists(filePath))
                    {
                        return default(T);
                    }

                    var fs = new FileStream(filePath, FileMode.Open);
                    var xs = new XmlSerializer(typeof(T));

                    var config = (T)xs.Deserialize(fs);

                    fs.Close();

                    return config;
                }
            }
            catch(Exception ex)
            {
                Trace.TraceError("ConfigHelper load fail, filepath:{0},ex:{1}", filePath, ex);
            }

            return default(T);
        }

        /// <summary>
        /// 保存XML配置文件
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="filePath"></param>
        /// <param name="config"></param>
        /// <returns></returns>
        public static bool Save<T>(string filePath, T config)
        {
            try
            {
                lock(ioLock)
                {

                    var fs = new FileStream(filePath, FileMode.Create, FileAccess.Write, FileShare.None);
                    var xs = new XmlSerializer(typeof(T));

                    xs.Serialize(fs, config);

                    fs.Close();
                }

                return true;
            }
            catch(Exception ex)
            {
                Trace.TraceError("ConfigHelper Save fail, filepath:{0},ex:{1}", filePath, ex);
            }
        
            return false;
        }

        /// <summary>
        /// 修改AppSettings中配置
        /// </summary>
        /// <param name="key">key值</param>
        /// <param name="value">相应值</param>
        public static bool SetConfigValue(string key, string value)
        {
            try
            {
                Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
                if (config.AppSettings.Settings[key] != null)
                    config.AppSettings.Settings[key].Value = value;
                else
                    config.AppSettings.Settings.Add(key, value);
                config.Save(ConfigurationSaveMode.Modified);
                ConfigurationManager.RefreshSection("appSettings");
                return true;
            }
            catch
            {
                return false;
            }
        }
    }
}